Here I'll have to disagree with some of my friends as I really like the Gray color. If you settle for just a Red AI or TI, like NOHUHU then maybe you need black ones to try to tone it down, but with the faster Yellow or Dune Islands, both look great in ether color!
In bright sun neither color is a problem with glare, but the Red hull color causes me an after-effect of seeing a large green spot for a few seconds after looking at it on the water.
Look how the Gray colored Sprayskirts make this AI stand out.
Where the Black Sprayskirt on the Red, tones down all that Red, almost disappearing.
Also, I choose Gray for my home-made heavy-duty fishing tramp, so I can see everything I put on it!
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Hobie Island Sailing since 2006